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which element has 21 protons
which element has 31 protons
which element has 22 protons
which element has 11 protons
which element has 20 protons
which element has 11 protons in its nucleus
which element has 11 protons and 11 neutrons
which element has 11 protons and 12 neutrons
which element has 20 protons in its nucleus
which element has 20 protons and 20 neutrons
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